Calluses or corns are the result of accelerated multiplication by ________.
A. keratinocytes
B. tactile cells
C. melanocytes
D. fibroblasts
E. red blood cells
Answer: A
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Which of the following statements regarding the control of parturition is FALSE?
A. Coordinated uterine contractions cause the cervix to dilate. B. Oxytocin secretion is stimulated by cervical dilation. C. Stretching of the myometrium is one signal that begins uterine contractions. D. Oxytocin decreases the expression of myometrial estrogen receptors. E. Prostaglandins stimulate myometrial contractions.
Generation of an action potential at an axon of a neuron may be caused by
A) a change in the number of Schwann cells surrounding the axon. B) stimulation of any portion of the dendrites of the neuron. C) input from various presynaptic cells. D) stimulation of any portion of the dendrites of the neuron and/or input from various presynaptic cells. E) All of the answers are correct.
Which of the following helps explain the increased tension seen in multiple wave summation?
A. Exposure of more active sites on myosin myofilaments B. The breakdown of elastic elements in the cell C. Decreased stimulus frequency D. Increased motor unit recruitment E. Increased concentration of Ca2+ around the myofibrils
The two functional portions of the pituitary gland are the
A. infundibulum and neurohypophysis. B. pars nervosa and pars tuberalis. C. neurohypophysis and adenohypophysis. D. adenohypophysis and infundibulum. E. infundibulum and hypothalamohypophysial portal system